I watched all 4 videos, and he does not have an aimbot. He could have a wallhack, but he was scoping around corners when people were not there and not scoping when a sniper is crouched down around the corner.
I have seen people with aimbots, either his is the shittiest ever since he misses half the time, or he isn't hacking at all.
Probably should make it clear, that I don't think he has a wallhack at all.